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This article mainly introduces "the usage of Linux basic command diff". In daily operation, I believe many people have doubts about the usage of Linux basic command diff. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the doubts about "the usage of Linux basic command diff"! Next, please follow the editor to study!

Diff

Compare two text files line by line to show the differences in the files to standard output. If you specify that you want to compare directories, the diff command compares files with the same filename in the directory, not subdirectories. The scope of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUSE, Fedora.

1. Grammar

Diff [options] files

2. List of options

Option

Description

-v |-- version

Display command version information

-- help

Show help documentation

-m |-- mode=MODE

Set the permissions of the directory

-I |-- ignore-case

Ignore case when comparing

-- ignore-file-name-case

Ignore case when comparing file names

-- no-ignore-file-name-case

Case cannot be ignored when comparing file names

-E |-- ignore-tab-expansion

Do not compare tab

-b |-- ingore-space-change

Do not compare the number of spaces

-w |-- ignore-all-space

Ignore all spaces

-B |-- ignore-blank-lines

Do not compare blank lines

-I res |-- ignore-mathcing-lines=res

Lines containing the specified string res are not compared

-- strip-trailing-cr

Go out and enter what follows the line.

-a |-- text

Treat all files as text files

-c-C NUM-- context [= NUM]

Display the front and back parts of the differences. The default is 3 lines.

-u-U NUM-- unified [= NUM]

Displays the front and back parts of the similarities. The default is 3 lines.

-- label LABEL

Use the label of the file instead of the name

-p |-- show-c-function

When comparing c language files, the functions that show the differences

-F RE |-- show-function-line=RE

Show the most recent line that matches the RE

-Q |-- brief

Only show whether there are differences, not details

-e |-- ed

Output an ed script

-- normal

Output a normal diff

-n |-- rcs

The results are displayed in rcs.

-y |-- side-by-side

Display the comparison results in a side-by-side manner

-W num |-- width=NUM

Specify the column width when using the "- y" option

-- left-column

Output only the left column of the common row

-- suppress-common-lines

Do not output public lines

-D NAME |-- ifdef=NAME

Export the merge file to show the difference of'# ifdef NAME'

-- GTYPE-group-format=GFMT

Same as above, the GTYPE input group can be formatted with GFMT

-- line-format=LFMT

Same as above, the GTYPE input group can be formatted with LFMT

-- LTYPE-line-format=LFMT

Same as above, LTYPE input lines can be formatted with LFMT

-l |-- paginate

Pass the output to pr "for paging

-t |-- expand-tabs

Expand tabs to spaces in the output

-T |-- initial-tab

Align tabs with preset tabs

-N |-- new-file

Treat absent files as empty files

-- unidirectional-new-file

Treat the first absent files as empty files

-s |-- report-identical-files

When two files report at the same time

-X FILE |-- exclude-from=FILE

Exclude files that match any pattern in the file

-S FILE |-- starting-file=FILE

When comparing directories from a file

-r |-- recursive

Compare all files in a subdirectory recursively

-x path

Do not compare specified files

-- from-file=FILE1

Compare FILE 1 with all operands. FILE 1 can be a directory

-- to-file=FILE2

Compare all operands to file 2. File 2 can be a directory

-- horizon-lines=NUM

NUM lines that maintain common prefixes and suffixes

-d-- minimal

Try to find a set of smaller changes

-- speed-large-files

Suppose the file is large and there are many scattered small changes.

3. Examples

1) compare two files without parameters (only the first line of the two files is different)

[root@localhost test02] # diff 1.c 2.c / / Direct comparison, only the differences are output here

1c1

Compare two text files line by line to show the differences in the files to standard output.

2) use the option-y to output two files in a separate manner

[root@localhost test02] # diff-y 1.c 2.c / / use option y, where the full contents of the file are displayed as columns

Compare two text files line by line and display the differences in the files to the standard output, adAD file. | compare two text files line by line, and display the differences in the files to standard output.

If you specify to compare directories, the diff command compares texts with the same filename in the directory. If you specify to compare directories, the diff command compares texts with the same filename in the directory.

Scope of application of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUS the scope of application of this command: RedHat, RHEL, Ubuntu, CentOS, SUSE, openSUS

[root@localhost test02] # diff 1.c 2.c

3) specify the column width using the option-W

[root@localhost test02] # diff-y-W 100 1.c 2.c / / the column width specified here cannot be fully displayed, so there is no difference.

Compare two text files line by line, display the differences of files to the standard | compare two text files line by line, and display the differences of files to the standard.

If you specify that you want to compare directories, the diff command compares directories. If you specify that you want to compare directories, the diff command compares directories.

Scope of application of this command: RedHat, RHEL, Ubuntu, CentO the scope of application of this command: RedHat, RHEL, Ubuntu, CentO

4) compare catalogs

[root@localhost weijie] # diff test01 test02 / / only compare files with the same name in the directory

Diff test01/1.c test02/1.c

1c1

Compare two text files line by line and display the differences in the files to the standard output, adAD file.

5) use the option-Q to see if it is different

[root@localhost weijie] # diff-Q test01/1.c test02/1.c / / compare whether it is different

Files test01/1.c and test02/1.c differ / / only shows whether it is the same, but does not show the detailed differences.

At this point, the study of "the usage of the Linux basic command diff" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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